Resilient mounting for hermetic refrigeration compressors



y 1960 G. E. LA FORTE ETAL 2,935,279

RESILIENI MOUNTING FOR HERMETIC REFRIGERATION COMPRESSORS Filed Nov. 2, 1956 2 Sheets-Sheet 1 Fig.1.

x I VENTORS Gerald E. La Porfe, BY & Ladd L. Horn,

y 1950 G. LA FORTE ETAL 2,935,279

RESILI MOUNTING FOR HERMETIC REFRIGERATION COMFRESSORS Filed Nov. 2, 1956 2 Sheets-Sheet 2 INVENTORS GeraldELaPorie,

BY 2 Ladd Lflom,

ATTN.

Mama

RESILIENT MOUNTING FOR HERMETIC REFRIGERATION COMPRESSORS Gerald E. La Porte, Kenmore, and Ladd L. Horn, Blasdell, N.Y.

Application November 2, 1956, Serial No. 620,113

1 Claim. (Cl. 248--22) This invention relates to improvements in the resilient mounting of refrigeration compressors of the hermetic type, and it has particular reference to a mounting of this nature which is economical to fabricate, easy to assemble, which is durable and resistant to vibratory stresses, effects some reduction in the noise level during operation, and which is wholly contained within the peripheral area of the compressor casing.

A typical embodiment of the invention is illustrated in the accompanying drawings, wherein:

Fig. 1 is an elevation of a typical hermetic refrigeration compressor with the resilient mounting of this invention applied thereto;

Fig. 2 is a bottom plan of the compressor showing a mounting bracket secured thereto;

Figs. 3 and 4 are enlarged fragmentary diametrical sections through the assembled mounting, taken in planes at right angles to each other; and

Fig. 5 is an exploded perspective of the resilient elements of the mounting and a retaining plate.

In the well known hermetic compressor utilized in refrigeration machines, the electric motor and compressor proper are contained within a casing whose parts are welded together after assembly. Thus, in Figs. 1 and 2, the casing or shell 10, which encloses the motor, compressor, and auxiliary devices (which are not shown as they form no part of this invention) consists of an upper shell portion 11, and a lower shell portion 12, joined together by welding along a flange portion 13. Various fittings 14 and 15 may be provided for the ingress and egress of the refrigerant vapor, and some of the electrical control devices may be contained in junction box 16, as is also well understood.

In the use of compressors of this type, many attempts have been made to reduce vibrations of the unit, and to reduce the noise level. To these ends, it has been proposed and adopted as known practice to support the casing 10 by means of feet disposed about the periphery of the lower shell portion 12, which could receive or be supported on springs or blocks of rubber to provide a resilient mounting. Such types of mounting increase the space required to install the compressor, which often presents serious assembly problems, and, inasmuch as it is difficult to impose exactly the same compression or loading on the various feet and resilient members, a condition of imbalance may result, which manifests itself by an increase in vibrations and noise.

According to the present invention, outwardly projecting feet or mounting elements are eliminated, and the entire weight of the compressor is carried by a resilient construction, located at the bottom of the lower casing 12, and entirely within its peripheral area. To this end the casing section 12 is made with a generally concentric and reasonably fiat bottom portion 17, to which is secured, as by welding, a mounting bracket 18. The bracket 18 is formed with end flanges 19 abutting the bottom portion 17 of the casing and providing welding points 21, and with a central web 22 which is spaced from the bottom 17. The center of the web 22 is formed with a screw rates atent receiving aperture 23, and over it is placed a clip shaped nut 24. In a sense, the bracket 18 in effect forms a portion of the bottom wall 17.

As shown in the drawings, the compressor is adapted to be positioned on a sheet metal pan or base 25 of a type used in room air conditioning machines, and over an elevated portion 26 of such pan. A circular resilient grommet 27 of chloroprene rubber or other suitable material is formed with an upstanding annular flange 28 adapted to abut the bottom wall 17, a base portion 29 adapted to rest on the raised portion 26 of the pan 25, and having a substantially square opening 31 adapted to be aligned with an opening 32 in the portion 26, and also having a depending flange portion 33 extending through the pan opening 32. The size of the apertures 31 and 32 are such that the web 22 of the bracket 18 may fit therethrough.

An annular resilient ring 34 is positioned in an annular marginal groove 35 of a circular retainer disc 36, which disc is formed with a central aperture 37 to receive a bolt 38. The ring 34 and disc 36 are positioned underneath the raised pan portion 26, and the bolt 38 is threaded into the nut 22 and taken up to place the grommet 27 and the ring 34 under the desired degree of compression. It will be noted that there is no metallic path between the casing 10 or disc 36 and the pan 25 through which noise producing vibrations can be transmitted, and that the natural vibrations of the motor-compressor unit are effectively damped by the resilient members 27 and 34. As is clearly shown in the drawing, the parts are so proportioned that the bolt 38 neither abuts the casing bottom 17, nor projects below the bottom of the pan 25.

It will thus be seen that the invention provides an improved resilient mounting for hermetic refrigeration compressors, which is easy to install, and which eliminates a number of parts necessary to older type mountings. While the invention has been described with respect to a preferred embodiment which has been found well suited to its intended purposes, it will be understood that modifications may be resorted to without departure from its principles, as set forth in the following claim.

We claim:

A resilient mounting between a refrigerant compressor of the hermetic type and a base, said compressor having a substantially flat centrally located bottom and said base having a similar fiat portion having a central orifice therein, a bracket carried centrally on the bottom of said compressor base and having a rectilinear web spaced from said compressor base, and adapted to be entered loosely in the orifice of said base, a resilient grommet interposed between the bottom of said compressor and the flat portion of said base, said grommet being of circular disc formation and having an area substantially coextensive with the flat portions of said compressor bottom and said base, said grommet having a depending central portion forced thru the opening of said base and a rectilinear central opening for receiving said bracket, a retaining disc disposed under said base and having a central orifice, a screw extending thru the orifice of said disc and having a connection with the web of said bracket, and a resilient ring positioned between said disc and the under side of the flat portion of said base.

References Cited in the file of this patent UNITED STATES PATENTS 2,251,398 Clark Aug. 5, 1941 2,685,178 Eck Aug. 3, 1954 2,697,578 Whittam Dec. 21, 1954 FOREIGN PATENTS 463,322 Canada Feb. 21, 1950 

